Aethtjr o brien



UNITED STATEs PATENT OFFICE.

ARTHUR OBRIEN, OF HELENA, MONTANA, ASSIGNOR OF ONE-HALF TO HELEN E. MILLER, OF SAME PLACE.

VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 567,501, dated September 8, 1896. Application filed December 28, 1894. Renewed February 27, 1896. Serial No. 581,084. (No model.)

To all whom, it may concern.-

Be it known that I, ARTHUR OBRIEN, a citizen of the United States, residing at Helena, in the county of Lewis and Clarke and State of Montana, have invented certain new and useful Improvements in Ventilators; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the, art to which it appertainsto make and use the same, reference being hadto the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention is directed to devices for promoting draft, and has for its object the production of an improved ventilator adapted for application to chimneys, vent-pipes, and the like, and by the operation of which is obtained the maximum draft for the purposes of carrying off products of combustion or foul air, as the case may be; and by reason of its peculiar construction and operation the device may also be employed effectively for supplying fresh air to mines and tunnels and other places where foul or gas-laden air is present.

The nature of my invention will fully and clearly appear by a reading of the subjoined description when taken in connection with the accompanying drawings, which form a part of this specification, and in which- Figure 1 is an elevation of my improved ventilator. Fig. 2 is a vertical central longitudinal section thereof, and Fig. 3 is a crosssectional view on line 00 0c of Fig. 2.

Referring to the said drawings by letter, A denotes a pipe, preferably circular in crosssection, which is secured in any desired manner to the chimney, vent-pipe, air-pipe, or the like. To the upper end of this pipe A is secured the head 13, from which extends a downwardly-inclined deflector 0.

cl is a circular plate concentric with the pipe and secured thereto by inclined arms e, having a central opening d, from which depends a pipe f of gradually-diminishing diameter, and which pipe extends to a point within the pipe A, as shown. The plate (1 is located above the top of pipe A, and the skeleton frame or support therefor permits of a free passage of the products of combustion or gas-laden air, as the case may be, from the source of generation to the outer atmosphere. Above the plate d, and secured thereto by vertical and radial partitions e, is a conical-shaped dome 9, formed of a plate g, and a cone-shaped top piece 9 both of which are centrally apertured to receive a vertical corrugated tapered pipe h, which projects into the pipe f and fits same closely at certain points, but leaves passages 7L between such points which communicate with the pipe f and the outer atmosphere through the passages 7t between the plates cl and g and the partitions e. Secured to the lower end of pipe f, in a manner to permit of removal when desired, is a cup i of larger diameter than said pipe and lapping the latter, and within this cup and adjacent to the end of the pipe is a cone-shaped deflector j, having a flanged edge 7", curved as shown to cause the downdrafts to be deflected to the proper channel.

In the operation of my improved ventilator the action is of a siphon nature, and by a simple manipulation the device may be employed to either vent impure air or products of combustion or to supply pure air to mines, tunnels, or the like. For ventilating chimneys, vent and like pipes the device is furnished with the deflecting-cup, which in operation causes horizontal or vertical outer aircurrents to be carried back, but through a diiferent channel. The horizontal currents of atmospheric air enter the head through the horizontal passages 71, and thence by the passages h' to the cup deflector, which in turn causes the currents to ascend through pipe A and to be finally discharged into the outer air through the outlets between the top of pipe A and the plate d. By this action a partial vacuum is created in the pipe A and a strong draft induced which draws the prod nets of combustion or impure air from the sources of generation through said pipe to the outer air. The same operation and results are attained in the event of vertical air-currents, which pass downward through pipe 71. and by the cup are deflected through the same channels as are taken by the horizontal aircurrents. v

When employing the device for supplying fresh air to mines, tunnels, or the like, the cup deflector is removed and the vertical or horizontal air-currents are carried directly in a downward direction to the desired point or points, inasmuch as with the cup removed the pipe f is open and in free communication with pipe A. Y

The ventilator, though simple in construction, is very effective for the purposes for which it is intended, and may be produced and applied for a very small cost.

I claim as my invention- 1. A ventilator comprising in combination the pipe A, the pipe f, lateral passages leading thereto, and the pipe h open to the atmosphere and projecting into said pipe f, and the said opening, the head B, the pipe it passed through said head and into pipe f, the cup deflector removably secured to said pipe f, and the outer inclined deflector, all substantially as and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

ARTHUR OBRIEN.

lVitnesses:

HENRY S. Porrs, E. W. KNIGHT, Jr. 

